Department Events

Events

  • Feb
    26

    Alexey Snezhko: Emergent Dynamics in Active Spinner Materials

    McCormick-Engineering Sciences and Applied Mathematics

    4:00 PM M416, Technological Institute

    EVENT DETAILS

    Title: Emergent Dynamics in Active Spinner Materials

    Speaker: Alex Snezhko, Material Science Division, Argonne National Laboratory

    Abstract: Strongly interacting colloids driven out-of-equilibrium by an external periodic forcing often develop nontrivial collective dynamics. Active magnetic colloids proved to be excellent model experimental systems to explore emergent behavior and out-of-equilibrium phenomena. Ferromagnetic micro-particles, suspended at a liquid interface and energized by a uniaxial in-plane alternating magnetic field spontaneously form arrays of self-assembled spinners rotating in either direction. The spinners, emerging as a result of spontaneous symmetry breaking of clock/counterclockwise rotation of self-assembled particle chains generate vigorous vortical flows at the interface. An ensemble of spinners exhibits chaotic dynamics due to self-generated advection flows. Furthermore, erratic motion of spinners at the interface generates chaotic fluid flow reminiscent of two-dimensional turbulence. Rotational homogeneous alternating magnetic fields applied along the supporting interface, spontaneously form ensembles of synchronized self-assembled spinners. Experiments reveal nontrivial collective dynamics in large ensembles of synchronized magnetic spinners that can spontaneously form dynamic spinner lattices at the interface in a certain range of the excitation parameters. Magnetic micro-particles immersed in water and sediment on the bottom surface of the turn into colloidal rollers when energized by a single-axis homogeneous alternating magnetic field applied perpendicular to the surface supporting the particles. The rolling motion emerges as a result of spontaneous symmetry breaking of the particle rotations in external field in a certain range of excitation parameters. Experiments reveal a rich collective dynamics of magnetic rollers. Flocking and spontaneous formation of steady vortex motion have been observed. The effects are fine-tuned and
    controlled by the parameters of the driving magnetic field.

    The research was supported by the U.S. DOE, Office of Basic Energy Sciences, Division of Materials Science and Engineering.

    -----

    To subscribe to the Applied Mathematics Colloquia List send a message to seminar-join@esam.northwestern.edu

    more less

    TIME Monday, February 26, 2018 at 4:00 PM - 5:00 PM

    LOCATION M416, Technological Institute    map it

    ADD TO CALENDAR SHARE

    CONTACT Beth Anne Siculan    b-siculan@northwestern.edu EMAIL

    CALENDAR McCormick-Engineering Sciences and Applied Mathematics

  • Feb
    26

    Segal Design Leadership Series presents: Every Day is a Prototype

    McCormick School of Engineering and Applied Science

    4:00 PM McCormick Auditorium, James L Allen Center

    EVENT DETAILSmore info

    TIME Monday, February 26, 2018 at 4:00 PM - 5:00 PM

    LOCATION McCormick Auditorium, James L Allen Center    map it

    ADD TO CALENDAR SHARE

    CONTACT Northwestern Engineering Events    northwestern-engineering-events@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Mar
    1

    Northwestern Engineering Dean's Seminar Series presents: Blockchain for the Enterprise: So Much More than Cryptocurrencies

    McCormick School of Engineering and Applied Science

    4:00 PM ITW Classroom, 1-350, Ford Motor Company Engineering Design Center

    EVENT DETAILSmore info

    TIME Thursday, March 1, 2018 at 4:00 PM - 5:00 PM

    LOCATION ITW Classroom, 1-350, Ford Motor Company Engineering Design Center    map it

    ADD TO CALENDAR SHARE

    CONTACT Northwestern Engineering Events    northwestern-engineering-events@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Mar
    17

    Winter Classes End

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Saturday, March 17, 2018

    ADD TO CALENDAR SHARE

    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Mar
    19

    Winter Examinations Begin

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Monday, March 19, 2018

    ADD TO CALENDAR SHARE

    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Mar
    24

    Spring Break Begins

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Saturday, March 24, 2018

    ADD TO CALENDAR SHARE

    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Apr
    1

    Easter

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Sunday, April 1, 2018

    ADD TO CALENDAR SHARE

    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar